Well I'm glad that this season doesn't seem to be going to spill over into the NYD special so I can just forget it ever happened - as seems to be the case on Earth, at least in Liverpool. Did the Flux destroy most of the universe and half the solar system? No-one seems to have noticed or even care. Mach's principle states that local physical laws are determined by the large-scale structure of the universe. Taking most of that universe away should probably screw up the laws of physics as we know them, most noticeably regarding inertia.
ETA: I gave the episode a 6, which seems over generous, but I think I was just glad it was over.
ETA: I gave the episode a 6, which seems over generous, but I think I was just glad it was over.